Definition of cladogenesis in English:

noun

This process of organic transformation includes anagenesis as well as cladogenesis.

Parallel cladogenesis between host and pathogens would be indicative of ancient coevolution, a reciprocal process in which characteristics of one organism evolve in response to specific characteristics of another.

In other words, the earliest species to diverge have undergone the most prolonged coevolution with their particular array of potential hosts and accordingly have become more specialized even in the absence of cladogenesis.